The decompiled client's DoMatchingBase.SettingCardMasterId calls
jsonData["card_master_id"].ToInt() with no Keys.Contains guard when
matching_state ∈ {3004, 3007, 3011}. Omitting the field crashes the
client with KeyNotFoundException at Cute.NetworkManager+Connect.
Add CardMasterId to DoMatchingResponseDto with a default value of 1
(matching the /load/index response and prod captures). Extend the
controller test to assert the field is present.
Caught during the v1 smoke walk-through; full client log line:
[Error: Unity Log] KeyNotFoundException: The given key was not
present in the dictionary.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
MessagePack [Key("...")]-keyed contracts reject unknown fields, so request
DTOs that omit BaseRequest's envelope (viewer_id, steam_id,
steam_session_ticket) fail deserialization on the real msgpack wire path.
Routing smoke + JSON-direct tests didn't catch this because S.T.J. tolerates
extra keys and the routing smoke uses ValidBaseRequestJson, but anything
sent via the actual client encrypted=True path threw
MessagePackSerializationException.
Fix: every Arena*Request now inherits BaseRequest. Also updates the JSON
controller tests + e2e to include the envelope so the [ApiController]
auto-400 validation passes.
Discovered via /arena_colosseum/get_fee_info crash on the in-game arena
screen.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
